From: Gary Wright <gwtmp01@...>
Date: 2009-08-23T04:07:59+09:00
Subject: Re: Process or Thread?


On Aug 22, 2009, at 1:43 PM, Mario Camou wrote:
>
> That's  true if you´re running MRI, since it uses "green" threads  
> (i.e., you
> really have a single OS-level thread that gets task-switched by Ruby
> itself). However, if you run on JRuby, the Ruby Thread support gets  
> mapped
> onto the Java Thread support, which *does* map to OS-level threads and
> therefore will take advantage of multiple cores if you have them. In  
> that
> case you *would* get faster processing.

For a CPU intensive task (image processing), i doubt that two OS
threads running on two core's is going to be any more efficient
than two processes running on two cores.  Multi-threading introduces
complications that are neatly avoided by using multiple processes.
I'd much rather deal with a multi-process architecture than a
multi-threaded architecture.

Gary Wright